US10693726B2 - Method and device for the configuration of a transmission link - Google Patents

Method and device for the configuration of a transmission link Download PDF

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US10693726B2
US10693726B2 US15/714,257 US201715714257A US10693726B2 US 10693726 B2 US10693726 B2 US 10693726B2 US 201715714257 A US201715714257 A US 201715714257A US 10693726 B2 US10693726 B2 US 10693726B2
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data transmission
transmission unit
communication channel
transmitter
side data
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US20180019918A1 (en
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Azad Ravanshid
David Gozalvez Serrano
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H04L41/0823—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability
    • H04L41/0836—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability to enhance reliability, e.g. reduce downtime
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
    • H04L1/0018—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement based on latency requirement
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0019—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy in which mode-switching is based on a statistical approach
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H04L41/0823—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability
    • H04L41/083—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability for increasing network speed

Definitions

  • the invention relates in general to the area of wireless communication with at least one mobile subscriber via a communication channel with varying availability.
  • the invention relates to a data transmission method as well as an associated data transmission unit, which are improved with regard to the reliability of the data transmission, wherein reliability requirements of services and applications can in particular be taken into account.
  • wireless data transmission has a broad range of applications beyond conventional mobile communication.
  • Several examples of application are road traffic safety technology, rail traffic control systems, industrial applications and e-health applications.
  • Many applications and services are dependent on the reliability of the data transmission, i.e. the successful and prompt transmission of information.
  • it is necessary in the case of road traffic safety applications based on wireless data transmission that a very high percentage of safety alerts is correctly transmitted within a specific time interval (see Intelligent Transport Systems (ITS); Vehicular Communications; Basic Set of Applications; Definitions, ETSI Technical Report TR 102 638 Rev. 1.1.1, 2009.)
  • Safety alerts that are not delivered or are delivered incorrectly represent a high risk potential.
  • a wireless data transmission system cannot be designed in practice such that it can ensure a reliable data link at all times and under all circumstances, since such a system would be inefficient and/or associated with high energy consumption.
  • HARQ hybrid automatic repeat request
  • AMC adaptive modulation and coding
  • HARQ is based on the combination of forward error correction (FEC) and repeated transmission of data unusable at the receiver side and is split up into HARQ-type-I and HARQ-type-II.
  • FEC forward error correction
  • HARQ-type-I also plain automatic repeat request, ARQ
  • ARQ plain automatic repeat request
  • erroneous packets are simply deleted and retransmitted.
  • HARQ-type-II also HARQ with incremental redundancy, IR-HARQ
  • an attempt is made to combine the erroneous data transmitted in various repeated transmissions. The probability of a successful transmission is thus increased.
  • HARQ and AMC or other known measures cannot guarantee an error-free and prompt data transmission, i.e. ensure the latter with 100% probability, in cellular communication systems on account of the random fluctuations of the transmission quality of the wireless communication channel.
  • the data transmission concept of DE 10 2013 221 649.1 is based on the idea of ascertaining, before the transmission of data, a probability of availability of the communication channel and of transmitting data only when there is sufficient probability of availability. That is to say that a data transmission should only take place when the probability of data transmission errors is very low or approaches zero.
  • Time interval-dependent coding (deadline dependent coding, DDC), such as is described for example in E. Uhlemann et al., “Deadline dependent coding—a framework for wireless real-time communication”, International Conference on Real-Time Computing Systems and Applications”, December 2000, pp. 135-142, is a kind of HARQ.
  • DDC Time interval-dependent coding
  • the code rate and the number of transmission repetitions are calculated a priori, such that reliability-relevant parameters td and PDL can be achieved.
  • the reliability requirements are defined here as the successful transmission of data to be transmitted within a specific time interval with a specific probability.
  • Present cellular communication systems do not at present take account of such reliability requirements of services and applications in order to configure the data transmission. This limits the possibilities especially of a cellular communication system to guarantee reliability, and at the same time reduces its efficiency.
  • a core idea of the invention lies in the concept of integrating the availability indication of a communication channel into a data transmission method based on the HARQ concept, such as for example the DDC.
  • the data transmission method in this case takes account of predetermined reliability requirements of the application or service using the communication channel in the or for the configuration of the data transmission. As a result, the reliability of the data transmission for the service or application is improved on the one hand, but also the efficiency of the overall system.
  • a first aspect of the invention relates to a method for the data transmission at a transmitter-side data transmission unit comprising the steps:
  • the availability indicator shows that the communication channel is available, configuring the data of the data packet yet to be transmitted for a successful transmission within the still available time of a maximum permissible data transmission time determined by the real-time application for the data packet, and transmitting the data packet.
  • step a) information concerning the amount of data and/or the maximum permissible data transmission time and/or a maximum permissible transmission error rate can be transmitted from the real-time application to the transmitter-side data transmission unit.
  • boundary condition data can also be transmitted with the one first portion of the data packet to the receiver-side data transmission unit and/or can be pre-configured in the receiver-side data transmission unit and/or can be stored retrievably in a central database (a server) of the communication system.
  • the transmission of the first portion of the data packet serves as a basis for the receiver-side prediction of the availability of the communication channel for the current transmission horizon.
  • the current transmission horizon is understood here to mean the difference arising from the maximum permissible data transfer time for the data packet less the already elapsed time for one or, as the case may be, more (yet to be explained) transmissions of the first portion that have already taken place plus any pauses etc. within the current data transmission time.
  • the first portion of the data packet serves as a basis for a receiver-side measurement of parameters (relevant for the transmission reliability) of the communication channel for predicting the availability of the communication channel.
  • the length of the first portion of the data packet can be determined by setting a specific number of information symbols and/or timeslots.
  • the length of the first portion can be determined in particular with regard to the current transmission horizon and the time variance of the parameters of the communication channel.
  • the first portion is preferably set short in the case of very rapidly fluctuating parameters of the communication channel.
  • the first portion is preferably set long in the case of slowly fluctuating parameters of the communication channel.
  • the length of the first portion is preferably determined on the basis of the coherence time of the communication channel. The length of the first portion is not therefore dependent on the maximum permissible data transmission time. In general, it is recommended, in the case of a very rapidly fluctuating communication channel (e.g.
  • the length of the first portion can amount to several hundred ms.
  • the coherence time of the communication channel is understood here to mean the time interval within which the coefficients of the impulse response of the communication channel can be assumed to be constant.
  • the method can also comprise the following steps:
  • step f) after a predetermined pause, repetition of the method from step b), if sufficient time for the transmission of the data packet is still available up to the lapse of the maximum permissible data transmission time for the data packet, i.e. up to the current transmission horizon.
  • the configuration of the data of the data packet yet to be transmitted for a successful transmission within the still available time of a maximum permissible data transmission time determined by the real-time application for the data packet includes in step iv): adjustment of the number and length of data blocks of the data packet yet to be transmitted taking account of transmission repetitions of individual data blocks that are to be expected.
  • the transmitter-side data transmission unit can, if it has been ascertained that the communication channel is not available, terminate a data transmission link to the associated receiver-side data transmission units and release the assigned communication channel for use by another data transmission units.
  • This can preferably be implemented already on or in the physical (PHY) and/or Medium Access Control (MAC) layer of the transmission protocol used.
  • PHY physical
  • MAC Medium Access Control
  • An opportunistic allocation of subscribers to communication channels of a communication system can thus be achieved based on the availability of the communication channel ascertained at the time. This is particularly advantageous for the efficiency of communication systems with a plurality of subscribers (multi-user system), in which different messages are to be transmitted to different subscribers in the coverage range of the communication system.
  • the transmitter-side data transmission unit can for example be a base station of a mobile radio system and can be set up to assign communication channels, as a limited radio resource of the mobile radio system, only to those subscribers for whom a positive availability has been established according to the reliability requirements of the application or service of the communication channel using said communication channel.
  • an initiated data transmission is stopped until more favorable communication channel properties are available, i.e. the communication channel is available according to the criteria defined here.
  • a second aspect of the invention relates to a method for data transmission at a receiver-side data transmission unit comprising the steps:
  • determining an availability indicator for the availability of the communication channel on the basis of parameters of the communication channel measured during the reception of the first portion of the data packet and on the basis of the predicted parameters of the communication channel for the still available remainder of a predetermined maximum permissible data transmission time for the transmission of the data packet; iii) transmitting of the determined availability indicator to the transmitter-side data transmission unit; iv) receiving the remaining data packet if the determined availability indicator shows that the communication channel is available.
  • the determination of the availability of the communication channel in step b) preferably takes place on the basis of parameters of the communication channel measured during the transmission of the first portion of the data packet and predicted for the remaining period up to the current transmission horizon.
  • the parameters for the communication channel can be one of or a combination of the following: an ACK statistic, a NACK statistic, SINR values, fluctuation values in respect of the communication channel in the time range, coherence times of the communication channel, an amount of an intercarrier interference in an orthogonal frequency multiplex system (OFDM), a Doppler frequency, CQI values, RSSI values, RSRQ values, RSCP values, MIMO-Rank values, Ec/Io value, QCI value.
  • OFDM orthogonal frequency multiplex system
  • ACK acknowledgeledge
  • ACKnowledge describes a signal for confirming a data transmission.
  • NACK (Not ACKnowledged) describes the rejection of transmitted data and its acknowledgement.
  • SINR Signal-to-Interference-and-Noise-Ratio
  • CQI Channel Quality Indicator
  • RSSI Receiveived Signal Strengths Indicator
  • RSRQ Reference Signal Received Quality
  • RSCP Received Signal Code Power
  • Ec/Io indicates the ratio of the average power of the communication channel to the total signal strength.
  • MIMO-Rank (Multiple-Input-and-Multiple-Output Rank) denotes in communication engineering the use of a plurality of transmission and reception antennas for wireless communication, wherein Rank describes the ratio to one another.
  • QCI Quality Class Indicator
  • LTE Long Term Evolution
  • Step iv) can also comprise: 1) calculating a value for the accumulated mutual information content (ACcumulated Mutual Information, ACMI) after each transmission repetition of a data block of the data packet and 2) comparing the calculated ACMI value with the ACMI value according to the estimated parameters for the communication channel; and 3) transmitting an adapted data block size to the transmitter-side data transmission unit to compensate for deviations between the calculated ACMI value and the estimated ACMI value. It is thus possible to compensate for prediction errors in the parameters for the communication channel that have a negative influence on the configuration of the data of the data packet yet to be transmitted for a successful transmission within the still available time up to the current transmission horizon.
  • ACMI ACcumulated Mutual Information
  • a third aspect of the invention relates to a transmitter-side data transmission unit for providing a communication channel for a real-time application, wherein the data transmission unit comprises: at least one data output/reception unit, at least one availability determination unit for determining the availability of a communication channel between the data output/reception unit of the data transmission unit and at least one receiver-side data transmission unit, wherein the availability determination unit is set up to perform a method according to the first aspect of the invention.
  • a fourth aspect of the invention relates to a receiver-side data transmission unit for providing a communication channel for a real-time application, wherein the receiver-side data transmission unit comprises: at least one data output/reception unit, at least one availability determination unit for determining the availability of a communication channel between the data output/reception unit of the data transmission unit and at least one transmitter-side data transmission unit, wherein the availability determination unit is set up to perform a method according to the second aspect of the invention.
  • a data transmission unit can be configured both as a transmitter-side data transmission unit according to the third aspect and also as a receiver-side data transmission unit according to the fourth aspect. That is to say that such a data transmission unit can perform both the role of the transmitting data transmission unit and also of the receiving data transmission unit.
  • a further aspect of the invention thus relates to a data transmission unit for providing a communication channel for a real-time application, wherein the data transmission unit comprises: at least one data output/reception unit, at least one availability determination unit for determining the availability of a communication channel between the data output/reception unit of the data transmission unit and at least one transmitter-side data transmission unit, wherein the availability determination unit is set up to perform the method according to the first and the second aspect of the invention.
  • the data transmission unit of the third, fourth and further aspect of the invention can also comprise: an availability output unit, which is configured for outputting the availability indicator, and/or a data transmission request unit, which is configured for triggering an availability request to the availability determination unit.
  • the data transmission unit of the fourth and further aspect of the invention preferably comprises, for its receiver-side role, one or more detection units for detecting at least one of the aforementioned parameters of the communication channel, which detection unit is set up to transmit the detected or measured parameter data to the availability determination unit.
  • the data ascertained by the unit or the units for monitoring the communication channel parameters are sent or transmitted to the availability determination unit, so that the availability of the communication channel can be determined inter alia depending on these parameters.
  • a fifth aspect of the invention relates to a data communication system with at least one transmitter-side data transmission unit according to the third or further aspect of the invention and a receiver-side data transmission unit according to the fourth or further aspect of the invention.
  • the data transmission units preferably serve to provide a communication channel for a real-time application.
  • the communication channel is preferably constituted between a transmitter-side data transmission unit according to the invention and at least one further receiver-side data transmission unit.
  • the receiver-side and/or transmitter-side data transmission unit can also be a base station of a communication network, so that a data transmission or the provision of a communication channel for a real-time application between a data transmission unit according to the invention and a further data transmission unit can take place via the communication network.
  • the data transmission units can also each be regarded and constituted as devices and can comprise corresponding device features such as for example electrical components, an electronic circuit, a microprocessor for processing commands of a computer program and so forth, so that a method sequence according to the invention is implemented in each case.
  • a parameter relevant to the availability of the communication channel for example the signal-to-noise ratio SINR for the following T ⁇ i timeslots up to maximum transmission time T, is predicted or estimated at the receiver-side data transmission unit.
  • the prediction can take place for example by means of a linear extrapolation, such as is explained for example in M. Ni et al., “A channel feedback model with robust SINR prediction LTE systems”, IEEE European Conference on Antenna and Propagation, EuCAP, pages 1866-1870, 2013.
  • the receiver-side data transmission unit determines the availability of the communication channel, i.e. whether the communication channel is sufficiently reliable. The availability thus determined is communicated by the receiver-side data transmission unit to the transmitter-side data transmission unit by means of the availability indicator.
  • the availability indicator e.g. SINR
  • the communication channel has been determined as sufficiently reliable, i.e. the latter is classified as available, the data transmission of the message can be continued up to the end of the transmission block. Otherwise, if the communication channel has been determined as not sufficiently reliable, i.e. the latter is classified as not available, the data transmission can be terminated.
  • the data already received up to then at the receiver-side data transmission unit up to time t i + ⁇ i which are present for example in a receive buffer memory, are discarded.
  • the transmitter-side data transmission unit can repeat the transmitter-side process after a predetermined pause ⁇ , as long as sufficient time is still available up to the lapse of the maximum permissible transmission time T.
  • the receiver-side data transmission device will then also re-determine, always after the transmission of the first ⁇ i bit, the availability of the communication channel, as described above, as long as sufficient time is still available for the transmission of the data packet, i.e.
  • ⁇ j 1 J ⁇ ⁇ ij + ( J - 1 ) ⁇ ⁇ ⁇ T - n ⁇ ( ⁇ i + ⁇ ) , wherein ⁇ is a runtime delay between successive transmission blocks, and n is the counter to establish how often the communication channel has been classified as not available, i.e. not sufficiently reliable.
  • a sixth aspect of the invention relates to a vehicle with a transmitter-side data transmission unit according to the third aspect of the invention and/or a receiver-side data transmission unit according to the fourth aspect of the invention or a data transmission unit according to the further aspect of the invention.
  • the vehicle preferably comprises a processor which implements the real-time application, in particular a driver-assistance functionality, such as for example a brake assist system. Similar advantages arise as those that have already been described in connection with the transmitter-side and receiver-side data transmission unit.
  • the data transmission unit of the vehicle can be connected to at least one sensor for determining a vehicle parameter under operating conditions for transmitting sensor data to the availability determination unit.
  • the sensor can be set up to determine the vehicle speed and/or to determine the direction of travel and/or to determine the distance from an obstacle.
  • the sensor can be at least one camera and/or a radar system and/or a LIDAR system.
  • the determination of the availability of the communication channel in step c) of the method according to the second aspect can take place depending on vehicle parameters, in particular depending on a vehicle speed and/or a direction of travel of the vehicle and/or positional data of the vehicle and/or a distance from another vehicle.
  • the availability of the communication channel can be indicated to a driver of the vehicle in a display unit of the vehicle, preferably by means of a symbol in a driver information system, for example in an instrument cluster or a head-up display.
  • the display of the availability indicator can take place as an absolute display, i.e. a display can take place as to whether a communication channel is available or not. In this connection, a distinction needs to be made solely between two display symbols. If the display unit for indicating the availability of the communication channel indicates for example no availability of the communication channel, the driver can conclude from this that his vehicle cannot establish a connection or a communication with other vehicles. For example, this may mean that a brake assist system of the vehicle cannot receive the signals of a vehicle travelling in front.
  • the driver is thus informed that the brake assist system is possibly not automatically engaging, so that the driver is required to maintain a raised state of awareness.
  • the lack of availability of a communication channel may also mean that a data link to a service which runs on a back-end server, which can be reached via a base station of a communication network, cannot be established.
  • a service may for example be an information service for the current traffic situation.
  • the driver assistance functionality can for example be set up, on the basis of the availability of the communication channel, to make a decision to initiate a driver assistance measure, in particular to initiate a steering intervention and/or a vehicle acceleration and/or a braking action and/or a speed reduction in a first mode and/or a second mode.
  • the driver assistance functionality is preferably operated in the first mode as a function of data received from the communication channel and in the second mode as a function of data of the at least one sensor for determining a vehicle parameter.
  • a switch from the first mode into the second mode and vice versa preferably takes place depending on the availability of the communication channel.
  • the data transmission unit can in principle be a mobile communication device, e.g. a cellular telephone, but also an on-board computer of a vehicle with corresponding communication interfaces.
  • the data output/data reception unit may be a close-range radio unit, such as for example a Wi-Fi unit and/or a Bluetooth unit and/or a ZigBee unit, but also in addition or alternatively a mobile radio unit.
  • a mobile radio unit the latter can be based for example on a 3GPP standard, such as the LTE standard or a future mobile radio standard, such as for example the 5G standard.
  • the data output/data reception unit can of course be based, alternatively or in addition, on another communication standard for wireless communication, such as for example the 802.11p or a future standard.
  • the real-time application can for example be automatic rail traffic control systems, e-health services and comparable industrial applications.
  • the methods and data transmission units according to the invention can be used not only in automotive applications, but also on all other wireless transmission systems or applications. This applies both to wireless communication systems which are based on a direct device-to-device communication, such as for example the standard 802.11p, or on an infrastructure-based communication, such as for example 3GPP LTE.
  • FIG. 1 illustrates diagrammatical a data transmission method between two data transmission units via a communication channel in accordance with an embodiment of the present invention.
  • FIG. 2 shows three sequence examples of the data transmission method of FIG. 1 .
  • FIG. 1 shows a first data transmission unit 10 and a second data transmission unit 10 ′, which provide a communication channel 15 for data transmission between a transmitter-side real-time application 20 and a receiver-side real-time application 20 ′.
  • Real-time applications 20 , 20 ′ may for example each be a vehicle safety application, such as for example a brake assist of a driver assistance system.
  • First and second data transmission unit 10 , 10 ′ are than respectively located in an associated first and second vehicle.
  • real-time applications 20 , 20 ′ may implement identical or complementary functions.
  • the real-time application may however also be a client real-time application 20 ′ in a driver information system of a vehicle, which communicates via a data link with a host real-time application 20 on a back-end server.
  • Second data transmission unit 10 ′ is then located in an associated vehicle and first data transmission unit 10 for example in a base station of a radio communication network or mobile communication network, such as for example the latest 3GPP LTE mobile communication network.
  • a service which informs subscribers about the present traffic situation may run for example as host real-time application 20 on the back-end server.
  • client real-time application 20 ′ it may then for example be a navigation system of the vehicle, which graphically displays the current traffic situation to the driver or takes account of the information concerning the present traffic situation in the navigation.
  • client real-time application 20 ′ consumes the service that is provided by host real-time application 20 .
  • a client-server relationship thus exists between real-time applications 20 , 20 ′.
  • First and second data transmission unit 10 , 10 ′ comprises in each case a data output/data reception unit 30 , 30 ′ and in each case an availability determination unit 40 , 40 ′.
  • Availability determination units 40 , 40 ′ each serve to determine the availability of communication channel 15 between data transmission units 10 , 10 ′—put more precisely, between data output/data reception units 30 , 30 ′, which are each connected to associated real-time application 20 , 20 ′.
  • the embodiments for data transmission units 10 , 10 ′ represented in FIG. 1 are identically constituted data transmission units. That is to say that both first and second data transmission unit 10 , 10 ′ may each function as a transmitting as well as a receiving data unit.
  • an availability output unit 41 is further provided as part of availability determination unit 40 , which availability output unit is configured for outputting an availability indicator for communication channel 15 .
  • the availability indicator may be obtained from real-time application 20 by a data transmission request unit 42 .
  • Data output/data reception unit 30 is configured to transmit data packets reliably within a fixed time window (as maximum permissible data transmission time) via communication channel 15 .
  • availability determination unit 40 determines, in the interaction with receiver-side availability determination unit 40 ′ yet to be explained, the availability of communication channel 15 .
  • the determined availability indicator may be transmitted with the aid of availability output unit 41 to real-time application 20 .
  • a data transmission request from real-time application 20 is received in a first step by data transmission unit 10 .
  • Availability determination unit 40 determines the availability of communication channel 15 .
  • information concerning the amount of data and/or the maximum permissible data transmission time and/or the maximum permissible transmission error rate may be transmitted by real-time application 20 as reliability requirements to data transmission unit 10 , in particular to availability determination unit 40 .
  • Availability determination unit 40 determines, taking account of the communicated reliability requirements for the data to be transmitted, the availability of communication channel 15 .
  • Availability determination unit 40 essentially establishes whether the data transmission request by real-time application 20 can be granted because the requested data transmission can be carried out with the required reliability.
  • real-time application 20 wants to communicate with real-time application 20 ′ with specific reliability requirements via a communication channel 15 .
  • Real-time application 20 wants for example to transmit specific information to real-time application 20 ′.
  • Real-time application 20 ′ may also transmit information to real-time application 20 .
  • first data transmission unit 10 as a transmitter wants to transmit data to second data transmission unit 10 ′.
  • second data transmission unit 10 ′ the corresponding reference numbers of FIG. 2 are used below for a better understanding.
  • first data transmission unit 10 receives a data transmission request for a data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 from real-time application 20 operatively connected to data transmission unit 10 . Then (step b), data output/data reception unit 30 transmits, under control of availability determination unit 40 , a first portion ⁇ 1 , ⁇ 2 , ⁇ 3 of data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 to receiver-side second data transmission unit 10 ′ via communication channel 15 .
  • step i) First of all (step i), first portion ⁇ 1 , ⁇ 2 , ⁇ 3 of data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 is received at second data transmission unit 10 ′ with second data output/data reception unit 30 ′ there, said first portion having been transmitted via communication channel 15 by transmitter-side first data transmission unit 10 .
  • second availability determination unit 40 ′ of second data transmission unit 10 ′ determines the availability of communication channel 15 on the basis of parameters of communication channel 15 measured during the reception of first portion ⁇ 1 , ⁇ 2 , ⁇ 3 of data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 and on the basis of estimated parameters of communication channel 15 for the still available remainder of a predetermined maximum permissible data transmission time T for the transmission of data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 .
  • second availability determination unit 40 ′ transmits an availability indicator AI for indicating the availability of communication channel 15 to transmitter-side first data transmission unit 10 via second data output/data reception unit 30 ′ and first data output/data reception unit 30 of first data transmission unit 10 to first availability determination unit 40 .
  • the determination of the availability of communication channel 15 by second availability determination unit 40 ′ may take place inter alia depending on parameters of communication channel 15 .
  • Communication channel parameters suitable for this are for example one or more of the following: an ACK statistic, a NACK statistic, an SINR value, transmission fluctuation values of the communication channel in a defined time range, the coherence time of the communication channel, an amount of an intercarrier interference in an orthogonal frequency multiplex system (OFDM), a Doppler frequency, a CQI value, an RSSI value, an RSRQ value, an RSCP value, a MIMO-Rank value, an Ec/Io value, a QCI value.
  • data transmission units 10 , 10 ′ and/or availability determination units 40 , 40 ′ each comprise a corresponding communication channel parameter unit 50 , 50 ′.
  • availability indicator AI for communication channel 15 is then (step c) received by data output/data reception unit 30 from receiver-side second data transmission unit 10 ′.
  • step d under the control of first availability determination unit 40 , if availability indicator AI shows that communication channel 15 is available, first data output/data reception unit 30 is configured for data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 for a successful transmission within the still available remainder of maximum permissible data transmission time T of the data of data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 yet to be transmitted, said maximum permissible data transmission time being determined by real-time application 20 or 20 ′.
  • the rest of data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 is then transmitted by first data output/data reception unit 30 to second data output/data reception unit 30 ′.
  • the rest of data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 is duly received by second data output/data reception unit 30 ′.
  • the configuration of first data output/data reception unit 30 for the transmission of the data of data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 yet to be transmitted preferably includes an adjustment of the number and length of data blocks of data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 yet to be transmitted taking account of transmission repetitions of individual data blocks that are to be expected.
  • step a) information concerning the amount of data and/or maximum permissible data transmission time T and/or a maximum permissible transmission error rate is communicated by real-time application 20 to transmitter-side first data transmission unit 10 .
  • This information can also be transmitted to receiver-side second data transmission unit 10 ′ with the one first portion ⁇ 1 , ⁇ 2 , ⁇ 3 of data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 .
  • this information can also already be pre-configured in transmitter-side first or receiver-side second data transmission unit 10 or respectively 10 ′. It is also possible for this information to be stored at a central point in the communication system, e.g. on a central server, and for it to be able to be retrieved from there by data transmission units 10 , 10 ′.
  • first portion ⁇ 1 , ⁇ 2 , ⁇ 3 of data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 serves as a basis for the receiver-side prediction of the availability of communication channel 15 for the transmission horizon still available.
  • the still remaining transmission horizon is determined as the difference arising from required maximum permissible data transmission time T for data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 less the time interval for one or if applicable more (still to be explained in connection with FIG. 2 ) transmissions of first portion ⁇ 1 , ⁇ 2 , ⁇ 3 that have already taken place within maximum permissible data transmission time T.
  • the length of first portion ⁇ 1 , ⁇ 2 , ⁇ 3 of data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 is determined for example by specifying or setting a specific number of information symbols and/or timeslots.
  • first portion ⁇ 1 , ⁇ 2 , ⁇ 3 of data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 parameters of communication channel 15 are measured at receiver-side data transmission unit 10 ′.
  • the measured parameters in particular their time variance, function as a basis for the prediction of the availability of communication channel 15 in respect of transmission horizon T still available.
  • First portion ⁇ 1 , ⁇ 2 , ⁇ 3 is preferably set short in the case of very rapidly fluctuating parameters of communication channel 15 .
  • First portion ⁇ 1 , ⁇ 2 , ⁇ 3 is preferably set long in the case of slowly fluctuating parameters of communication channel 15 .
  • the length of the first portion is preferably determined on the basis of the coherence time of communication channel 15 .
  • transmitter-side first data transmission unit 10 is preferably configured to terminate the current transmission of data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 (step e).
  • transmitter-side first data transmission unit 10 is preferably further configured to repeat the method from step b), if sufficient time is still available for a transmission of data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 up to the lapse of maximum permissible data transmission time T for data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 . That is to say that transmitter-side first data transmission unit 10 attempts in this embodiment as long as a transmission of data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 within maximum permissible data transmission time T is still possible with available communication channel 15 .
  • the receiver-side second data transmission unit 10 ′ is configured in step iv) to calculate a value for the accumulated mutual information content (accumulated mutual information), ACMI, after each transmission repetition of a data block of data packet T 11 , T 21 , T 22 , T 23 , T 31 , T 32 , T 33 to be transmitted and to compare the calculated ACMI value with an ACMI value which has been calculated on the basis of estimated parameters for communication channel 15 . On the basis of the comparison, receiver-side second data transmission unit 10 ′ then transmits an adapted data block size to transmitter-side first data transmission unit 10 , which then uses this value for the configuration of the data blocks. Deviations between the calculated ACMI value and the estimated ACMI value may thus be compensated for.
  • FIG. 1 the data transmission between data transmission units 10 and 10 ′ proposed here is illustrated in FIG. 1 on the basis of three different cases in FIG. 2 .
  • a data packet m 1 is ready for transmission at first data transmission unit 10 .
  • first portion ⁇ 1 (sub-frame) of coded data packet ⁇ 11 it would ascertained at receiver-side data transmission unit 10 ′ that communication channel 15 is not sufficiently reliable.
  • transmitter-side data transmission unit 10 attempts to re-transmit data packet ⁇ 11 .
  • the data transmission is then prefixed up to the end of data block ⁇ 11 .
  • the transmission of data packet m 3 in third time interval [t 0 +2T, t 0 +3T] differs from the two preceding examples 1 and 2 solely in that, on account of the non-availability of communication channel 15 in the first transmission attempt, the total data transmission has been delayed by predetermined pause ⁇ .
  • first data packet m 1 may be intended for a first subscriber
  • second data packet m 2 for a second subscriber
  • maximum permissible transmission time T does not necessarily have to be constant, but rather can be different in different time intervals.
  • the data transmission of the first subscriber may require as a reliability requirement a maximum transmission time T 1
  • the data transmission of the second subscriber requires as a reliability requirement a maximum transmission time T 2 , wherein T 1 ⁇ T 2 applies.

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DE102015205478.0A DE102015205478A1 (de) 2015-03-26 2015-03-26 Verfahren und Vorrichtung zur Konfiguration einer Übertragungsverbindung
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US20180019918A1 (en) 2018-01-18
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